Potato tubers antioxidants

El-Morsi, E. A., Abdel-Naem, G. R, Shaker, E. S., Ghazy, M. A. (2000). Influence of biofertilization on total phenolic compounds and antioxidative activity of potato tubers (Solanum tuberosum L.). Arab Univ J Agric Sci,8, 1-18. 

Andre, C. M., Ouflr,M., Guignard, C.,Hoffmann,L.,Hausman,J. F.,Evers,D., Larondelle, Y. (2007). Antioxidant profiling of native Andean potato tubers Solanum. tuberosum L.) reveals cultivars with high levels of 8-carotene, a-tocopherol, chlorogenic acid, and petanin. J. Agric. Food Chem., 55, 10839-10849. 

Figure 6.5 shows the structures of tra 5-cinnamic acid and four cinnamic acid derivatives (phenolic compounds) reported to be present in potatoes. Because potatoes are one of our major food plants, we validated with the aid of HPLC and LC/MS the content and distribution of antioxidative phenolic compounds in parts of the potato plant, in potato tubers, in the peel and flesh of tubers, in potatoes sold commercially in Korea and the United States, and in home-processed potatoes. The following discussion, based on our own studies, is followed by a brief overview of analytical methods for potato phenolic compounds by other investigators. 

Lukaszewicz, M., Matysiak-Kata, I., Skala, J., Fecka, I., Cisowski, W., Szopa, J. (2004). Antioxidant capacity manipulation in transgenic potato tuber by changes in phenolic compounds content. J. Agric. Food Chem., 52, 1526-1533. 

The patatin family consists of various glycoproteins in plants making up more than 40% of the total soluble protein in potato tubers. Patatins serve as storage proteins and it has been demonstrated that they exhibit both lipid acyl hydrolase and acetyl transferase activities, which might be involved in tissue wounding responses. Further, recent studies report on antioxidant activities of the major potato allergen Sola t 1 (Seppala et al. 2000). 

Perla, V. Holm, D. G. Jayanty, S. S., Effects of cooking methods on polyphenols, pigments and antioxidant activity in potato tubers. Lwt-Food Science and Technology (2012) 45,161-17L... 

Lukaszewicz M, Matysiak-Kata I, Skala J, Fecka I, Cisowski W, Szopa J (2004) Antioxidant capacity manipulatimi in transgenic potato tuber by changes in phenolic compounds content J Agric Food Chem 52 1526... 

The food technologist may be especially interested in the fate of the carotenoids in the seed oil. Like red palm oil, the resulting carotenoid-pigmented canola oil may be more stable due to the antioxidant properties of carotenoids and may be more attractive to consumers. Alternatively, for food security concerns, transgenic soybean or canola oils and seed meals that are genetically modified for more efficient bio-diesel production may be bio-safety marked with lipid-soluble carotenoids and water-soluble anthocyanins, respectively. Potatoes are excellent potential sources of dietary carotenoids, and over-expression of CrtB in tubers led to the accumulation of P-carotene. Potatoes normally have low levels of leaf-type carotenoids, like canola cotyledons. 

Rosenthal, S., Jansky, S. (2008). Effect of production site and storage on antioxidant levels in specialty potato Solanum tuberosum L.) tubers. Journal of the Science of Food and Agriculture, 88,2087-2092. 

A study of 74 Andean potato landraces found about an 11-fold variation in total phenolics and a high correlation between phenolics and total antioxidant capacity (Andre et al., 2007a). We screened tubers from hundreds of cultivars and wild potato species for phenolics and found over a 15-fold difference in the amount of phenolics in different potato genotypes. Many phenolics are colorless, and thus are relevant phytonutrients for white-fleshed cultivars, which are the consumer-preferred t5q)e of potato in many countries. Russet Norkotah has high amounts among the white-fleshed cultivars, about 4 mg/g DW. S. Pinnatisectum, a purple-fleshed wild species. 

Campos, D., G. Noratto, R. Chirinos, C. Arbizu, W. Roca, and L. Cisneros-Zevallos. 2006. Antioxidant capacity and secondary metabolites in four species of Andean tuber crops native potato (Solanum sp.), mashua (Tropaeolum tuberosum Ruiz Pavon), Oca (Oxalis tuberosa Molina) and ulluco Ullucus tuberosus Caldas). J. Sci. FoodAgr. 86 1481 — 1488. 

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